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Dive into the research topics where Vitor Rolim is active.

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Featured researches published by Vitor Rolim.


Revista De Saude Publica | 2014

Cumulative mortality of Aedes aegypti larvae treated with compounds

Sandra Maria de Torres; Nadine Louise Nicolau da Cruz; Vitor Rolim; Maria Inês de Assis Cavalcanti; Leucio Câmara Alves; Valdemiro Amaro da Silva Junior

OBJECTIVE To evaluate the larvicidal activity of Azadirachta indica, Melaleuca alternifolia, carapa guianensis essential oils and fermented extract of Carica papaya against Aedes aegypti (Linnaeus, 1762) (Diptera: Culicidae). METHODS The larvicide test was performed in triplicate with 300 larvae for each experimental group using the third larval stage, which were exposed for 24h. The groups were: positive control with industrial larvicide (BTI) in concentrations of 0.37 ppm (PC1) and 0.06 ppm (PC2); treated with compounds of essential oils and fermented extract, 50.0% concentration (G1); treated with compounds of essential oils and fermented extract, 25.0% concentration (G2); treated with compounds of essential oils and fermented extract, 12.5% concentration (G3); and negative control group using water (NC1) and using dimethyl (NC2). The larvae were monitored every 60 min using direct visualization. RESULTS No mortality occurred in experimental groups NC1 and NC2 in the 24h exposure period, whereas there was 100% mortality in the PC1 and PC2 groups compared to NC1 and NC2. Mortality rates of 65.0%, 50.0% and 78.0% were observed in the groups G1, G2 and G3 respectively, compared with NC1 and NC2. CONCLUSIONS The association between three essential oils from Azadirachta indica, Melaleuca alternifolia, Carapa guianensis and fermented extract of Carica papaya was efficient at all concentrations. Therefore, it can be used in Aedes aegypti Liverpool third larvae stage control programs.


artificial intelligence in education | 2018

Towards Combined Network and Text Analytics of Student Discourse in Online Discussions

Rafael Ferreira; Vitomir Kovanović; Dragan Gasevic; Vitor Rolim

This paper presents a novel method for the evaluation of students’ use of asynchronous discussions in online learning environments. In particular, the paper shows how students’ cognitive development across different course topics can be examined using the combination of natural language processing and graph-based analysis techniques. Drawing on the theoretical foundation of the community of inquiry model, we show how topic modeling and epistemic network analysis can provide qualitatively new insight into students’ development of critical and deep thinking skills. We also show how the same method can be used to investigate the effectiveness of instructional interventions and its effect on student learning. The results of this study and its practical implications are further discussed.


EC-TEL | 2018

Automated Analysis of Cognitive Presence in Online Discussions Written in Portuguese.

Valter Neto; Vitor Rolim; Rafael Ferreira; Vitomir Kovanović; Dragan Gasevic; Rafael Dueire Lins; Rodrigo Lins

This paper presents a method for automated content analysis of students’ messages in asynchronous discussions written in Portuguese. In particular, the paper looks at the problem of coding discussion transcripts for the levels of cognitive presence, a key construct in a widely used Community of Inquiry model of online learning. Although there are techniques to coding for cognitive presence in the English language, the literature is still poor in methods for others languages, such as Portuguese. The proposed method uses a set of 87 different features to create a random forest classifier to automatically extract the cognitive phases. The model developed reached Cohen’s \(\kappa \) of .72, which represents a “substantial” agreement, and it is above the Cohen’s \(\kappa \) threshold of .70, commonly used in the literature for determining a reliable quantitative content analysis. This paper also provides some theoretical insights into the nature of cognitive presence by looking at the classification features that were most relevant for distinguishing between the different phases of cognitive presence.


Arquivo Brasileiro De Medicina Veterinaria E Zootecnia | 2018

Anticorpos anti-Toxoplasma gondii em carcarás (Caracara plancus) procedentes da região aeroportuária do Recife, Pernambuco, Brasil

Luana Thamires Rapôso da Silva; J.S.A. Silva; Débora Costa Viegas de Lima; Vitor Rolim; M.F.V. Marvulo; J.C.R. Silva; Rinaldo Aparecido Mota; Andréa Alice da Fonseca Oliveira


Arquivo Brasileiro De Medicina Veterinaria E Zootecnia | 2018

Aspecto médico veterinário legal das lesões em aves silvestres promovidas por colisões com aeronaves

Luana Thamires Rapôso da Silva; J.S.A. Silva; R.F.S. Regueira; Vitor Rolim; Mércia R. Barros; Andréa Alice da Fonseca Oliveira


VI Congresso Brasileiro de Informática na Educação | 2017

Um Estudo Sobre Sistemas de Recomendação de Recursos Educacionais

Vitor Rolim; Rafael Ferreira; Evandro Costa; Anderson Cavalcanti; Máverick Dionísio


Revista Brasileira de Informática na Educação | 2017

Utilização de Técnicas de Aprendizado de Máquina para Acompanhamento de Fóruns Educacionais

Vitor Rolim; Rafael Ferreira; Evandro Costa


Brazilian Symposium on Computers in Education (Simpósio Brasileiro de Informática na Educação - SBIE) | 2016

Identificação Automática de Dúvidas em Fóruns Educacionais

Vitor Rolim; Rafael Ferreira; Evandro Costa


Anais dos Workshops do Congresso Brasileiro de Informática na Educação | 2016

Método Supervisionado para Identificação de Dúvidas em Fóruns Educacionais

Vitor Rolim; Rafael Ferreira; Evandro Costa


Ciência Veterinária nos Trópicos | 2015

Salmonella spp. research in wild birds from Metropolitan Region of Recife, Pernambuco, Brazil.

L. T. R. da Silva; Vitor Rolim; J. S. de Alcântara e Silva; G. de M. Silva; R. A. Mota; A. A. F. Oliveira

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Rafael Ferreira

Universidade Federal Rural de Pernambuco

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Evandro Costa

Federal University of Alagoas

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Andréa Alice da Fonseca Oliveira

Universidade Federal Rural de Pernambuco

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Luana Thamires Rapôso da Silva

Universidade Federal Rural de Pernambuco

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Rinaldo Aparecido Mota

Universidade Federal Rural de Pernambuco

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A. A. F. Oliveira

Federal University of Rio de Janeiro

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Anderson Cavalcanti

Universidade Federal Rural de Pernambuco

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Débora Costa Viegas de Lima

Universidade Federal Rural de Pernambuco

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